0.6.12.12:

0.6.12.12:
	(I went hunting unsuccessfully OpenBSD GC problems, didn't
		find them, and made small cleanups instead.)
	Dan Barlow's way of dealing with 64-bit slots in wrapped_stat
		is better than mine, and it's possible that mine is
		even responsible for my OpenBSD memory corruption
		problems, so convert the wrapped_st_size slot to
		32 bits.
	also renamed DB's my_dev_t to more-explicit ffi_dev_t